14 Facts About Spot welding

Spot welding is a type of electric resistance welding used to weld various sheet metal products, through a process in which contacting metal surface points are joined by the heat obtained from resistance to electric current.

The attractive feature of spot welding is that a large amount of energy can be delivered to the spot in a very short time .

Spot welding involves three stages; the first of which involves the electrodes being brought to the surface of the metal and applying a slight amount of pressure.

Spot welding process tends to harden the material, causing it to warp.

The physical effects of spot welding include internal cracking, surface cracks and a bad appearance.

The Spot welding electrodes are part of the transformer's secondary circuit.

Voltage needed for Spot welding depends on the resistance of the material to be welded, the sheet thickness and desired size of the nugget.

Resistance spot welding generates no bright arc, so UV protection is not required.

Spot welding is typically used when welding particular types of sheet metal, welded wire mesh or wire mesh.

Spot welding can be easily identified on many sheet metal goods, such as metal buckets.

Spot welding is used in the orthodontist's clinic, where small-scale spot welding equipment is used when resizing metal "molar bands" used in orthodontics.

Spot welding can keep the battery from getting too hot, as might happen if conventional soldering were done.

Projection welding is a modification of spot welding in which the weld is localized by means of raised sections, or projections, on one or both of the workpieces to be joined.

Projection Spot welding is often used to weld studs, nuts, and other threaded machine parts to metal plate.